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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f170b5453b78de998604a65e7ddc6160335c0bef9d8c40e5b417ee980179d4e4' 
  AND token = 'PNRBjMAeIAiBWXxA0cLgXmF30/JgZs80ABf2PeQwADE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}